Hydrology and Earth System Sciences
Hydrology and Earth System Sciences
HESS
Articles | Volume 29, issue 7
Articles | Volume 29, issue 7
https://doi.org/10.5194/hess-29-1963-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/hess-29-1963-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 29, issue 7
Research article
 | 
17 Apr 2025
Research article |  | 17 Apr 2025

Effect of the spatial resolution of digital terrain data obtained by drone on urban fluvial flood modeling of mountainous regions

Xingyu Zhou, Lunwu Mou, Tianqi Ao, Xiaorong Huang, and Haiyan Yang

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Short summary
This study explores using drone-acquired digital terrain models (DTMs) for flood modeling of mountainous urban rivers. Terrain analysis indicates that a DTM resolution of 1 m–5 m is optimal for accurate flood modeling. In larger cities with non-extreme discharge volumes, a resolution of 5 m–10 m can suffice for modeling inundation areas, although it may slightly overestimate flood depth. This provides a balance between model accuracy and processing costs.
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